Sand-molding apparatus.



No. 63l,494. Patented Aug. 22, I899.

s. J. ADAMS.

SAND MOLDING APPARATUS.

(Application filed Mar, 30, 1897.)

(No Model.)

Fig.1. i

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7/// ///////////Al lW//////////////// A UNITED STATES PATENT OFFICE.

STEPHEN JARVISADAMS, OF PITTSBURG, PENNSYLVANIA.

SAND-MOLDING APPARATUS.

SPECIFICATION forming part of Letters Patent No. 631,494, dated August 22, 1899.

Application filed March 30, 1897- Serial No. 629,920. (No model.)

T0 on whom it may concern.-

Be it known that LSTEP EN JARVIS ADAMS, a resident of Pittsburg, in the county of A1- legheny and State of Pennsylvania, have invented a new and useful Improvement in Sand-Molding Apparatus; and 'I do hereby declare the following to be a full, clear, and exact description thereof.

My invention relates to jarring mechanism in connection with sand-molding apparatus. In molding patterns of irregular shapes it has been found to be very difficult to compact the sand equally about the different projections or recesses on the patterns. In ordinarymolding the workman partially succeeds in doing this by having a rammer with the ends differing in shape, using a flat surface round in diameter at one end of his rammer and a narrow wedge -shaped face at the other and reverses them as the character of the pattern may require. This is evidently impossible in jarring mechanism. To meet this difficulty is the main object of this invention, by which I provide, in connection with jarring mechanism, a pliable follower-that is, a follower so constructed that the different parts of it may follow down within the sand-reservoir and so press upon the sand as to prevent its rebounding, while the follower itself Will conform practically to the shape of the pattern, and this I accomplish by forming the follower of one or more bags filled with metallic shot or like heavy loose materials which will enable the follower to conform to the shape of the pattern, as hereinafter set forth and claimed.

To enable others skilled in the art to make and use my invention, I refer to the following drawings, in 'which Figures 1 and 2 represent a vertical view of sections of the jarring apparatus with the (1, in which the piston-rod e operates. This piston-rod e is attached in any suitable way to the tablef and is made to move up and down by any desirable mechanism, such as by a cam or cams or an air or steam cylinder direct. The pattern-plate 9 supports the lower section of the flask containing the pattern. The sand-reservoir is shown at t, and above this reservoir is the follower guide-box j. Guided in said'box isthe pliable follower 7a, which consists of one or more bags made of canvas or other pliable material filled with metallic shot or like loose non-adherent material of such size and weight as may be found desirable. The preferred form of flexible follower is a number of small sausagelike bags m, each one holding the proper amount of shot and each operating upon the sand directly below it, so that there is no liability of the sand shift-ing sidewise under the jars, as may occur where a single bag is employed. This flexible follower is suspended over the flask by a rope when not in use and it is lowered down until its guide-box rest-s on the reservoir. Whether one bag or a number of bags are employed they are preferably hung from a board or plate n,which,as shown, fits within the follower guide-box j and during the jarring operation descends under the jarring stroke within that box and into the reservoir 2', as shown in Fig. 2. The rope p for supporting the flexible follower is connected to this board a.

It is obvious that in forming a mold when the jarring mechanism is in operation the flexible follower resting on the sand will adapt itself to the various inequalities of the pattern, as the shot will collect not only above the recesses of the pattern, but envelop the projections on the pattern, thus enabling the flexible follower to conform to the pattern and producing a uniform packing of the sand, and therefore preventing scabs or other imperfections on the surface of the castings 00- casioned by unequal ramming of the sand about the pattern. In Fig. 3 I have shown a different method of supporting the pliable follower, which is formed of a single bag containing the shot 10a and has cords secured at intervals to the inner face of the bottom of the bag and extend ing upwardly to a common point by which the bag is lifted when not in use, and its lower face is held approximately to a level, so that the shot are distributed evenly over the surface of the sand in the reservoir before the jarring takes place.

I thus provide, in connection with jarring mechanism, a pliable follower which adapts itself under the jarring movement to the irregularities as well as to the plain surfaces of the patterns to be molded, thus producing castings free from surface defects.

Vithin the term shot as used in the claims I include any suitable loose non-adherent material which will conform itself to the sand as it is jarred downwardly within the reservoir, and for that purpose metallic shot, pebbles, or other vitreous balls or like material, or even sand, maybe employed, all these beingincluded as equivalents within the term shot as used in the claims.

\Vhat I claim as my invention, and desire to secure by Letters Patent, is-

1. The combination of a jarring-table, a pattern, a flask and sand-reservoir and a pliable follower adapted to enter the reservoir, substantially as set forth.

2. The combination of a jarring-table, a pattern, a flask and sand-reservoir, a pliable follower adapted to enter said reservoir and a guide-box adapted to fit on top of said reservoir and guide the follower into the same, substantially as set forth.

The combination of a jarring-table, a pattern, a flask and reservoir and a pliable follower adapted to enter said reservoir, the follower having a bag containing shot, substantially as set forth.

4. The combination of a jarring-table, a flask and sand-reservoir and a pliable follower adapted to enter said reservoir, the follower being formed of a series of separate bags each containing shot, substantially as set forth.

In testimony whereof I, the said STEPHEN JARVIS ADAMS, have hereunto set my hand.

STEPHEN JARVIS ADAMS.

\Vitnesses:

ROBERT C. TOTTEN, RoBT. D. TOTTEN. 

